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1.
Oral sex from female to male.
I better get some schmevins on our 4 year anniversary! It's been too long!
by Captain Tubesock January 29, 2008
 
2.
An alternate word for the insult "retard". More discrete insult
That guy is a schmevin.

Look at that schmevin pissing into the wind.
by The Original Schmevin July 07, 2011